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dgx-spark-nccl Install and test NCCL on two Sparks — on NVIDIA DGX Spark. Use when setting up nccl on Spark hardware.

NCCL for Two Sparks

Install and test NCCL on two Sparks

NCCL (NVIDIA Collective Communication Library) enables high-performance GPU-to-GPU communication across multiple nodes. This walkthrough sets up NCCL for multi-node distributed training on DGX Spark systems with Blackwell architecture. You'll configure networking, build NCCL from source with Blackwell support, and validate communication between nodes.

Outcome: You'll have a working multi-node NCCL environment that enables high-bandwidth GPU communication across DGX Spark systems for distributed training workloads, with validated network performance and proper GPU topology detection.

Duration: 30 minutes for setup and validation · Risk: Medium - involves network configuration changes

Full playbook: /home/runner/work/dgx-spark-playbooks/dgx-spark-playbooks/nvidia/nccl/README.md